[Purpose/Significance]The research aimed to discover the focus of city identity in a period of time,and to analyze the public's overall impression of city and its dynamic changes.[Method/Process]Firstly,this paper proposed evaluation index,data source and calculation method for discovery of the focus of city identity.Secondly,it normalized the evaluation index by min-max normalization,and established evaluation model to calculate different cities'identities by linear weighted sum method.Finally,it discovered the focus of city identity of the si...